文献类型：期刊文献

英文题名：Simultaneous pore enlargement and introduction of highly dispersed Fe active sites in MSNs for enhanced catalytic activity

作者：Gu, Jin Lou[1];Dong, Xu[1];Elangovan, S. P.[2];Li, Yongsheng[1];Zhao, Wenru[1];Iijima, Toshio[2];Yamazaki, Yasuo[2];Shi, Jian Lin[1,3]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Nippon Chem Ind Co Ltd, Tokyo 1368515, Japan;[3]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

年份：2012

卷号：186

起止页码：208

外文期刊名：JOURNAL OF SOLID STATE CHEMISTRY

收录：;EI(收录号：20120414718269);WOS:【SCI-EXPANDED(收录号:WOS:000299801400032)】；

基金：This work was financially supported by Shanghai Pujiang Program (no. 09PJ1403000), Research Fund for the Doctoral Program of Higher Education (no. 20090074120009), Natural Science Foundation of China (nos. 51072053, 21001043), The New Century Excellent Talents in University (no. NCET-10-0379), the Fundamental Research Funds for the Central Universities (nos. WD0911012 and WK1013001) and the Program for Changjiang Scholars and Innovative Research Team in University (Grant no. IRT0825).

语种：英文

外文关键词：Nanotechnology; Mesoporous silica; Catalyst; Pore expansion; Heteroatoms

摘要：An effective post-hydrothermal treatment strategy has been developed to dope highly dispersed iron catalytical centers into the framework of mesoporous silica, to keep the particle size in nanometric scale, and in the meanwhile, to expand the pore size of the synthesized mesoporous silica nanoparticles (MSNs). Characterization techniques such as XRD, BET, SEM and TEM support that the synthesized samples are long period ordered with particles size about 100 nm and a relatively large pore size of ca. 3.5 nm. UV-vis, XPS and EPR measurements demonstrate that the introduced iron active centers are highly dispersed in a coordinatively unsaturated status. NH3-TPD verifies that the acid amount of iron-doped MSNs is quite high. The synthesized nanocatalysts show an excellent catalytic performance for benzylation of benzene by benzyl chloride, and they present relatively higher yield and selectivity to diphenylmethane with a lower iron content and much shorter reaction time. (C) 2011 Elsevier Inc. All rights reserved.